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Prestige 681 SDSL Router
3.2
Setting up the WAN link
You configure SDSL and Frame Relay settings in Menu 2 – WAN Setup. You need to know the following
information.
Q.1. Is your P681 acting as a SDSL server or as a client (see Figure 1-1, Figure 1-2 and Figure 1-3)? If
acting as a SDSL server, then select Server (Central Office) from the Service Type field. If acting as
a client, then select Client (Remote Terminal) from the Service Type field.
Q.2. Is your SDSL link compatible (Link Compatibility field) with Ascend/Lucent? This version of the
Prestige 681 currently supports Ascend (now part of Lucent) type SDSL routers only
Q.3. What is the actual transmission rate? The P681 SDSL router supports symmetrical multi-rate data
transmission speeds from 144Kbps up to 2320Kbps. You can increase the capacity of the Internet
connection (within certain limitations – see Table 3-2) without changing your ISP or buying new
equipment. Note that this table outlines the distance limitations only and does not mean that distance
determines the actual transmission speed agreed between you and the peer. Both the Prestige and the
peer must have the same transmission rate. Press the [SPACEBAR] in the Transfer Rate = field to step
through the transmission speed options and then
speed of the peer.
The following table outlines distance limitations on data transmission rates for AWG 26. AWG (American
Wire Gauge) is a measurement system for wire that specifies its thickness. As the thickness of the wire
increases, the AWG number decreases and the further you can transmit; the transmission distance is in
proportion to the square of the wire gauge (diameter)
Table 3-2
1
Future versions may support other type SDSL routers.
2
According to the table the maximum distance for a 0.4mm line (without any noise) transmitting at
528Kbps is 12000 ft. If you want to transmit at 528Kbps over a 0.6mm (AWG 24) line the maximum
distance you can transmit is 12000 x (.6)
3-4
SDSL Maximum Transmission Distances (AWG 26, 0.4mm)
Data Rate
144K
272K
400K
528K
784K
1168K
1552K
2320K
2
2
/(.4)
= 27000 ft or 8,228m (not taking noise factor into account).
press [ENTER] to
select the matching transmission
2
.
Distance (feet)
16,000
14,000
13,000
12,000
11,500
11,000
10,000
7,500
1
.
(meters)
4876
4267
3962
3658
3505
3352
3048
2289
WAN Setup
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